<template>
	<u-upload 
	 ref="upload"
	 :action="action" 
	 :max-size="5 * 1024 * 1024"
	 max-count="1"
	 :multiple="false"
	 :before-upload="beforeUpload"
	 :custom-btn="true"
	 :show-progress="false"
	 :form-data="formData"
	 :show-upload-list="true"
	 :deletable="false"
	 width="0"
	 height="0"
	 @on-success="onSuccess"
	 >
	 <u-avatar slot="addBtn" :src="vuex_user.avatar_url" size="140"></u-avatar>
	</u-upload>
	
</template>

<script>		
	let _this = {}
	export default {
		name:"oss-upload",
		data() {
			return {
				action:'',
				formData:{},
				upFileName:''
			};
		},
		created() {
			_this = this
		},
		methods:{
			//上传前的钩子
			/* 注意：在小程序中this可能会丢失 */
			async beforeUpload(index,list){
				const {file} = list[0]
				// #ifdef H5
				const fileName = file.name
				// #endif
				// #ifndef H5
				const fileName = file.path
				// #endif
				// 请求api，获取oss token
				const ossToken = await _this.$u.api.authOssToken()
				// 设置上传域名
				_this.action = ossToken.host
				// 处理唯一文件名
				const suffix = fileName.slice(fileName.lastIndexOf('.'))
				const upFileName = _this.$u.guid(20) + suffix

				_this.upFileName = upFileName

				//额外的上传参数
				_this.formData = {
					'key':upFileName,//上传后的文件名
					'policy':ossToken.policy,
					'OSSAccessKeyId':ossToken.accessid,
					'success_action_status': '200',//让服务端返回200，默认会返回204
					'signature':ossToken.signature,
				}
				return true;
			},
			/* 上传成功之后 */
			async onSuccess(){
				//移除预览区域的图片
				this.$refs.upload.remove(0)
				// 请求API更新头像
				await this.$u.api.userAvatar({avatar: this.upFileName}) 
				// 更新缓存的用户信息
				this.$u.utils.updateUser()
				this.$u.toast('更新成功')
			},
		}
	}
</script>

<style>

</style>